drm/i915: Use the size/type of address space to make decisions

Once the address space has been created (using 3 or 4 levels of page
tables), we should use that to program the appropriate type into the
contexts. This gives us the flexibility to handle different types of
address spaces at runtime.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170209144036.23664-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>

drivers/gpu/drm/i915/i915_gem_context.c

@@ -236,16 +236,20 @@ static int assign_hw_id(struct drm_i915_private *dev_priv, unsigned *out)
 	return 0;
 }
 
-static u32 default_desc_template(const struct drm_i915_private *dev_priv)
+static u32 default_desc_template(const struct drm_i915_private *i915,
+				 const struct i915_hw_ppgtt *ppgtt)
 {
+	u32 address_mode;
 	u32 desc;
 
-	desc = GEN8_CTX_VALID |
-		GEN8_CTX_PRIVILEGE |
-		GEN8_CTX_ADDRESSING_MODE(dev_priv) <<
-		GEN8_CTX_ADDRESSING_MODE_SHIFT;
+	desc = GEN8_CTX_VALID | GEN8_CTX_PRIVILEGE;
 
-	if (IS_GEN8(dev_priv))
+	address_mode = INTEL_LEGACY_32B_CONTEXT;
+	if (ppgtt && i915_vm_is_48bit(&ppgtt->base))
+		address_mode = INTEL_LEGACY_64B_CONTEXT;
+	desc |= address_mode << GEN8_CTX_ADDRESSING_MODE_SHIFT;
+
+	if (IS_GEN8(i915))
 		desc |= GEN8_CTX_L3LLC_COHERENT;
 
 	/* TODO: WaDisableLiteRestore when we start using semaphore
@@ -329,7 +333,8 @@ __create_hw_context(struct drm_i915_private *dev_priv,
 
 	i915_gem_context_set_bannable(ctx);
 	ctx->ring_size = 4 * PAGE_SIZE;
-	ctx->desc_template = default_desc_template(dev_priv);
+	ctx->desc_template =
+		default_desc_template(dev_priv, dev_priv->mm.aliasing_ppgtt);
 	ATOMIC_INIT_NOTIFIER_HEAD(&ctx->status_notifier);
 
 	/* GuC requires the ring to be placed above GUC_WOPCM_TOP. If GuC is not
@@ -387,6 +392,7 @@ i915_gem_create_context(struct drm_i915_private *dev_priv,
 		}
 
 		ctx->ppgtt = ppgtt;
+		ctx->desc_template = default_desc_template(dev_priv, ppgtt);
 	}
 
 	trace_i915_context_create(ctx);

drivers/gpu/drm/i915/i915_gem_gtt.h

@@ -525,6 +525,12 @@ i915_vm_to_ggtt(struct i915_address_space *vm)
 	return container_of(vm, struct i915_ggtt, base);
 }
 
+static inline bool
+i915_vm_is_48bit(const struct i915_address_space *vm)
+{
+	return (vm->total - 1) >> 32;
+}
+
 int i915_ggtt_probe_hw(struct drm_i915_private *dev_priv);
 int i915_ggtt_init_hw(struct drm_i915_private *dev_priv);
 int i915_ggtt_enable_hw(struct drm_i915_private *dev_priv);

drivers/gpu/drm/i915/i915_reg.h

@@ -3373,9 +3373,6 @@ enum {
 #define GEN8_CTX_L3LLC_COHERENT (1<<5)
 #define GEN8_CTX_PRIVILEGE (1<<8)
 #define GEN8_CTX_ADDRESSING_MODE_SHIFT 3
-#define GEN8_CTX_ADDRESSING_MODE(dev_priv) (USES_FULL_48BIT_PPGTT(dev_priv) ?\
-				INTEL_LEGACY_64B_CONTEXT : \
-				INTEL_LEGACY_32B_CONTEXT)
 
 #define GEN8_CTX_ID_SHIFT 32
 #define GEN8_CTX_ID_WIDTH 21

drivers/gpu/drm/i915/intel_lrc.c

@@ -332,7 +332,7 @@ static u64 execlists_update_context(struct drm_i915_gem_request *rq)
 	 * PML4 is allocated during ppgtt init, so this is not needed
 	 * in 48-bit mode.
 	 */
-	if (ppgtt && !USES_FULL_48BIT_PPGTT(ppgtt->base.dev))
+	if (ppgtt && !i915_vm_is_48bit(&ppgtt->base))
 		execlists_update_context_pdps(ppgtt, reg_state);
 
 	return ce->lrc_desc;
@@ -1447,7 +1447,7 @@ static int gen8_emit_bb_start(struct drm_i915_gem_request *req,
 	 * not needed in 48-bit.*/
 	if (req->ctx->ppgtt &&
 	    (intel_engine_flag(req->engine) & req->ctx->ppgtt->pd_dirty_rings)) {
-		if (!USES_FULL_48BIT_PPGTT(req->i915) &&
+		if (!i915_vm_is_48bit(&req->ctx->ppgtt->base) &&
 		    !intel_vgpu_active(req->i915)) {
 			ret = intel_logical_ring_emit_pdps(req);
 			if (ret)
@@ -2045,7 +2045,7 @@ static void execlists_init_reg_state(u32 *reg_state,
 	ASSIGN_CTX_REG(reg_state, CTX_PDP0_LDW, GEN8_RING_PDP_LDW(engine, 0),
 		       0);
 
-	if (ppgtt && USES_FULL_48BIT_PPGTT(ppgtt->base.dev)) {
+	if (ppgtt && i915_vm_is_48bit(&ppgtt->base)) {
 		/* 64b PPGTT (48bit canonical)
 		 * PDP0_DESCRIPTOR contains the base address to PML4 and
 		 * other PDP Descriptors are ignored.